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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> ® (713)660 0401 <br /> Quality Control Report <br />' EXXON Company U S A <br /> U P 3942 1 <br /> Analysis Purgeable Aromatics WorkOrder 01030308 <br /> Method SW8021B Lab Batch ID R31472 <br /> Analyte Sample MS MS Result MS% MSD MSD Result MSD% RPD RPD I Low High <br /> Result SpikeRecovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> enzene N01 20 23� 115 20 231 1131. 186 21 321 164 <br /> thylbenzene 1 NDI 20� 241 120 20 23 1141 5 51 191 52; 1421 <br /> Methyl tert-butyl ether NDI 201 19 909 20 181 89 11 2 05� 20f 39 150E <br /> oluene ! NDI 201 23 117 20 221 1121 4561 201 381 159 <br /> -n,p-Xylene ND� 401 48 119 40 461 115I' 3611 171 531 144, <br /> lo-Xylene ND 20� 241 121 20 231 1151 5 721 18 531 1431 <br /> ylenes Total ND 60 72� 120 601 691 1151 4 261 181 53E 1441 <br /> 1 <br /> I <br /> I <br /> �llflers NDIU-Not Detected at the Reporting Limit MI-Matrix Interference <br />' B -Analyte detected in the associated Method Blank D- Recovery Unreportable due to Dilution <br /> J -Estimated value between MDL and PQL '-Recovery Outside Advisable QC Limits <br /> The percent recoveries for QC samples are correct as reported Due to significant figures and 01030308 Page 26 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported 3121101 10 2400Ann <br />